Preposition - Study Mode

[#146] My younger brother is good . . . . . . . . mathematics.
Correct Answer

(D) at

[#147] Sam usually sits . . . . . . . . this chair.
Correct Answer

(B) on

[#148] The old man walked . . . . . . . . the road slowly. Which preposition is suitable to fill the blank?
Correct Answer

(A) across

[#149] The players agreed to abide . . . . . . . . the referee's decision.
Correct Answer

(C) by

[#150] They have been studying . . . . . . . . three hours todays.
Correct Answer

(B) for